Powdered-fuel and like burner



July 14, 1925.

F. S. BRIGHTMORE POWDERED FUEL AND LIKE BURNER Filed March 29. 1924 Jwvm TI'IORE',

duomey Patented July 14, 1925.

- UNITED STATES FRED STANLEY BRIGHTMORE, OF LONDON, ENGLAND.

POWDERED-FUEL AND LIKE BURNER.

Application filed March 29., 1924. Serial No. 702,750. A

To all whom it may concern:

Be it known that I, FRED STANLEY BRIGHT- MoRn, of 33 Furnival Street, Holborn, London, England, a subject of the King of Great Britain and Ireland, have invented certain new and useful Improvements in and Relating to Powdered-Fuel and like Burners, of which the following is a specification.

My invention relates to powdered-fuel and like burners, and it is directed to that type wherein. the fuel is initially projected or'propelled through the burner by a pressure fluid introduced at the inlet, and is subjected to the action of air and steam. at the outlet.

The object of my invention is to provde a burner of this type of simple and compact, but nevertheless eflective, construction.

To this end, the invention is, mainly, directed to the arrangement of the air and steam supplies at the. outlet; and, subordinately, to the provision of means for regulating the supply of the fuel to the burner from the hopper therefor. Accordingly, the air and steam are introduced within the burner to contact with the fuel before it leaves the burner; while a valve device is interposed between the fuel-hopper and the burner.

I will now describe, by way of example, one form of burner embodying the invention, with reference to the accompanying diagrammatic drawings wherein:

Fig. 1 is a side elevation; and

Fig. 2 is a corresponding plan, with a part in central section.

In this form, the burner comprises, as customarily, a pipe at provided at the inlet with a funnel-like bend or elbow-piece b for association with the fuel-supply hopper 0.

At the bend or elbow b the ordinary means.

are, as indicated at d, 03, applied for introducing the projecting or propellent fluid, usually compressed air.

At or about its junction with the hopper 0, I position within the bend or elbow b a diaphragm 6 having a series of holes ff, and a complementary movable plate or disc 9 having corresponding holes h-h and operable by a handle '5 to bring the two series of holes f/ and hh into register, or to vary the extent of their coincidence.

In proximity to the outlet end of the pipe a, I construct a chamber composed of a sleeve j surrounding, and secured to, the

pipe at whose projecting end is is reduced in diameter so that an annular space Z intervenes between them. Intermediate of the ends of the sleeve j and circumferentially thereof, I provide four holes at, n, 0, and p into each of which I introduce, respectively, one end of a tube Q, r, t and 8. These tubes q, 1", s and t are arranged in pairs, one pair g, 1' being for the supply of compressed air and the other 8, t for superheated steam. Appropriately the ends of the compressedair tubes 9, r are situated in advance of those 8, t conveying the superheated steam, and are of the larger diameter. The opposite ends of the respective pairs of tubes 9, 'r' ands, t are connected to a common supply pipe u on the one hand and 12 on the other, to which, in the case of the compressed air pipe to, the means, represented by the pipe d, supplying the propellent air is also connected. Valves, though not shown, are provided, as and where required, for controlling the fluid'supplies.

The rest of the components of the burner are of the ordinary kind and are assembled relatively to the pipe at in the customary fashion. Thus, for instance, a conical sleeve is, or may be, associated with the reduced end h of the pipe a, and one is, or both are, connected to a spreader.

Therefore, in use, as the fuel reaches the zone Z at the outlet where the air and steam are introduced it is subject to the action of, and mixes with, these fluids, with the consequential results.

Though Iv have explained the employment of two tubes 9, r and s, t for delivering the air and steam, one only may be furnished, or more than two; and instead of the air and steam tubes being of different diameters, they maybe of the same diameter,

or the steam tubes 8, t may be the larger. Again, the outlets of the air tubes 9, 1" may be in advance of those of the steam tubes 8, t. Further, the air may be delivered tothe'tubes d, g and 7" cold, or more or less so, or it may be positively heated by the introduction of steam or other hot fluid to the compressor or other source of supply; or, if desired, the steam or hot fluid may be introduced directly into the tubes d, g and r; or the common supply pipe u.

What I claim and desire to secure by Letters Patent is 1. A powdered fuel burner comprising, in combination, a fuel-supply pipe, said pipe having a materially reduced outlet end, a sleeve surrounding and securedto said pipe about such end so that an annular space constituting a chamber intervenes between them, means for supplying a fuel propellentfluid to, and axially of, said pipe, and separate self-contained tubes communicating with said chamber and conveying air and steam thereto, said tubes being positioned exteriorly of said fuel-supply pipe.

2. A powdered-fuel burner comprising, in combination, a fuel-hopper, a fuel-supply pipe in association with said hopper, a chamber at the outlet end of said pipe and in communication therewith, said outlet end being materially reduced means supplying a fuel propellentfiuid to, and axially of, said pipe, separate self-containedtubes conveying air and steam to said chamber, said tubes being located exteriorly of said fuelsupply pipe and a valve device interposed between said fuel-hopperand said fuel-supp y p p 3. A powdered-fuel burner comprising, in combination, a fuel-hopper, a fuel-supply pipe in association with said hopper, a

chamber at theoutlet end of saidpipe and in communication therewith, said, outlet end being materially reduced means sup plying a fuel propellent-fluid to, and axially of, said pipe, separate self-contained tubes conveying air and steam to said chamber, said tubesbeing locatedexteriorly of said fuel-supply pipe, and a valve-device interposed between said fuel-hopper and said fuel-supply pipe, said device consisting of a diaphragm positioned Within said'fuel-supply pipe and having a series of holes, a complementary movable plate or disc havin corresponding holes, and a handle to sai movable plate or disc for operating'itto vary the register of said series of holes.

4. A powdered fuel burner comprising, in combination, a fuel-hopper, a fuel-supply pipe in controlled communication with said hopper, said pipe having a materially reduced outlet end, a sleeve surrounding and secured to said pipe about said outlet-end so that an annular space constituting a chamber intervenes between them, means for supplying afuel propellent-fluid to, and axially-of, said pipe, separate self-contained tubes communicating with said chamberand conveying air and steam thereto, said tubes being positi-onedexteriorly of said fuel-supply pipe, and a hit-and-miss valve interposed between said fuel-hopper and said fi'iel-supply pipe controlling the flow of fuel therebetween.

In testimony whereof, I aflix my signature.

g STANLEY 'BRIGHTMORE. 

